João Costa
@JD557@blog.joaocosta.eu
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Portuguese software engineer at Kevel.
My instance is running on a small server so please #nobot
- GitHub
- Itch.io
This weekend I was playing around with defining an animation DSL.
I've wanted to play this for a while after watching @davesmith00000's interview for "Scala for Fun & Profit" and @kubukoz Playdate talk. Everyone's doing DSLs for gamedev! 
It's still quite rough, but I think it's useful for things like menu animations. Maybe I'll use something like this in the next GameJam entry to add a bit more juice to the menus.
This example looks like this:
val backgroundAnimation = {
linear(0, 512, 10.0).loop
.map(delta => (delta.toInt, delta.toInt))
.translateWrap
}
val baloonAnimation = {
val rotation =
(linear(-Math.PI / 32, Math.PI / 32, 1.0) >> linear(Math.PI / 32, -Math.PI / 32, 1.0)).rotate
val beat =
(easeOut(1.2, 0.9, 0.5) >> easeIn(0.9, 1.0, 0.1)).scaleXY
(rotation && beat).loop.map(asSurfaceTransform)
}
val textAnimation = {
val rotation =
(easeIn(-Math.PI / 32, Math.PI / 32, 1.0) >> easeIn(Math.PI / 32, -Math.PI / 32, 1.0)).rotate
val beat =
(easeIn(1.3, 0.9, 0.5) >> easeIn(0.8, 1.0, 0.1)).scaleXY
(rotation && beat).loop.map(asSurfaceTransform)
}
@davesmith00000@mastodon.gamedev.place There you go!
I do need to clean up some hacks before I share the full thing. 
@JD557 Looks good! Not a million miles away from Indigo's.
With the benefit of hindsight, I have wondered about the wisdom of a DSL over a builder-like pattern. The latter is surely better for IDE discoverability, though obviously not as pretty to look at. 🤔
@davesmith00000@mastodon.gamedev.place Why not both? 
It's probably not that hard to have both a DSL and a builder just by adding a named .withX version to each operators.
@JD557 screenshot of the formatted code needed. 😁